GEOG281 Lecture Notes - Lecture 5: Map Algebra, Euclidean Distance, Spatial Database

• School: University of Waterloo
• Department: Geography and Environmental Management
• Course: GEOG281
• Professor: Su Yin Tan

Document Summary

Rectangular grids with equally sized cells: resoluion is determined by its cell size. Each cell has a value: if not deined: nodata or -9999. All values stored in a raster must be of the same data type (integer, loat, double, etc. ) Can be stored inside or out of a geodatabase, and in a variety of formats. Make sure spaial analyst extension is turned on. Leave everything default if not told to change. No spaces and must start with a leter. We can only take so many measurements (gps measurements of elevaion. We must interpolate data to ill in gaps. A mathemaical formula to esimate of reality: using exising data to esimate unknown values. Assumed: tobler"s law: near things are more related than distant things. Closer points have more inluence on an esimated point than distant points. Data set(s) created as output from the operaion.